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Full text of "The manufacture and properties of iron and steel"

THE HISTORY AND SHAPE OF THE TEST-PIECE.
317
TABLE XVKF. Comparison of Parallel and Grooved   (Marine)   Sections.
Thickness of plate in inches.	S-( o $ii g oim M^ rt> gA,	Average ultimate strength; pounds per square inch.			Reduction of area,	
		Grooved.	. Parallel,	Difference.	Grooved.	Parallel.
1	4 6 5 4 8	65600 62700 60900 61300 60600	53100 62800     . 51400 63500 64100	12500 9900 9500 7800 6500	62.0 51.4 und. 61.7 60.0	58.0 64.6 68.2 65.3 66.6
less, but its existence will be shown by the following records. At a certain works it was the custom to cut two tests from one plate of each heat and pull one piece in a section 2 inches long and 1| inches wide, with shoulders on each end, while the other piece was pulled in a parallel-sided section 8 inches long and 3 inches wide. Table XVI-G gives the results. The records show that in only 71 plates did the 2-inch test show less tensile strength than the 8-inch, and in half of these cases the difEerence was less than
TABLE XVI-G.
Ultimate Strength of 2-inch Tests with  Shoulders, and 8-inch Parallel-Sided Tests.
	S       							
11 H*-* aa 3S o^	2       -a . ' as-gg . 1MM g-gd).^ SS'SSa	Ultimate strength : 60000 to 68000 pounds per square inch; below .04 per cent, phosphorus.			Ultimate strength ; 68000 to 64000 pounds per square inch ; below .04 per cent, phosphorus.			
o^S J?S< 2114	|51 Sl^ fiS31.							1
		!|	J2	S|	o ^ *^Ti	*i	?!	
<D on a ft	S aiiN-w p, P	^	X*	sf	:*"	r3	X"	
	less than 1000	6	10	3	4	7	4	84
2 inch gave	bet. 1000 and 2000	3	4	2	1	1	, . , .	11
less strength than the	bet. 2000 and 8000 bet. 8000 and 4000	1 1	3	"l '	4 1	2 8	' 'i '	10 T
8 inch	bet 4000 and 6000		2		1			8
	over 5000				3	8		
'	Total	11	id	6	14	16	5	71
	less than 1000	23	28	4	2	7	4	68
2 inch gave	bet. 1000 and 2000	23	86	4	8	16	6	98
more str'ngth than the	bet. 2000 and 8000 bet. 8000 and 4000	15 4	15 13	3 5	8 8	8 8	4	68 28
8 inch.	bet. 4000 and 6000	6	6	2	....	2	3	16
	over 6000	2	15	2	1	2	1	23
	Total	72	112.	20	22	88	17	*fl.,